Method and apparatus for manufacture of flanges on plates



METHOD AND APPARATUS FOR MANUFACTURE OF FLANGES ON PLATES Filed March 18, 1921 2 Sheets-Sheet 1 Figri 1 1921 2 Sheets-$heet 2 F. LJUNGSTRGM METHOD AND APPARATUS FOR MANUFACTURE OF FLANGES ON PLATES Filed March 1M am W Mm Patent Aug. H923.

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JEBEJDRIK LJ'UNGSTMM, OF JBRJEVIK, LEINGON, SWEDEN, ASSIGNOR T0 BOLAGET LJ'UNGSTBOMS ANGTUBBIN, OF STOCOLM, SWEDEN, A GOBPOTIO mn'rnon arm arranafircs roa UFACTURE-OF FLANGES PLATE.

Application filed march 18, 1921. Serial No. 453,526.

To all whom it may concern:

Be it known that I, FREDRIK LJUNcsTRoM chief engineer, subject of the King of Sweden, residing at Brevik, Lidingon, Sweden, have invented certain new and use ful Improvements in the Method and Apparatus for Manufacture of Flanges on Plates, of which the following is a specification.

This invention relates to improvements in the manufacture of projecting ribs or flanges on plates or the like, particularly cooling ele cuts for instance consisting of flattened pipes. The invention consists in that the ribs or flanges are formed by means'of two jaws movable towards and from each other and the plate and then forced together.

A deviceby the aid of which this manufacture may be effected is illustrated in the accompanying drawings in which Fig. 1 is a partial vertical section of an apparatus adapted for the said purpose, 2 is a partial vertical section of a modified embodiment ofthe apparatus. Fig. 3 is a detailed view of the edges of the jaws when being depressed in the plate of the work piece. Fig. 4 is a plan view of the lowermost one of the two jaws co-operating in pairs. Fig. 5 is a diagrammatic view of an eccentric press adapted to be used for the manufacture. Fig. 6 shows on a lar er scale a part of a flattened pipe used as t e work piece-and a rail inserted in said pipe.

Referring to the embodiments shown in Fig. 1, 1 is the plate to be provided with ribs or flanges. Said plate which in this case is to be provided with parallel ribs or flanges on both sides is fed forward between two pairs of 'co-operatin jaws consisting of two upper jaws 2 and two lower jaws 3, rovided with edges 4 and 5 respectively. ach pair of jaws'is inserted in a casing 6 and 7 respectively, actuating the jaws, the jaws being first caused by the easings to perform a parallel motion towards the plate, thus forming a projection or lug on the plate between the latter and the edges of the jaws, the jaws then being forced together so as to press the projection to form a rib or flange. To eflect said first-named movement of the jaws a spring 27 is preferably inserted between the same and the casing and so adjusted that the edges of the jaws will be suficiently forced down into the plate, before the jaws Fig. th

in which case abutments on the jaws or the casing determine the extent to which the edges are to be forced into the plate, before the jaws by being forced into the casing are caused by meansof the conical surfaces 11 and 12 to be brought together and thus to press together the Between the springs 13 may jaws of each pair of jaws preferably be inserted.

The pressure exerted by the" may also exceed this pressure,

material lying between i In the embodiment illustrated in Fig. 2 i

showing contrary to Fig. 1 the parts in their positions while pressing the projections or lugs togetherthe alteration is made that the jaws 2 and 3, while being forced into the casings 6 and 7 1 .pectively, are turned about pins 24, pins 14; being adapted to slide on the pistons 10. Balls or other abutting members ma be substituted for said pins. Also in this case the pressure conduits 8 effects the determined pressure above the piston 10. The edges 4: and 5 of the jaws are thereby forced into the work piece which in this case consists of a flattened ipe 15 having inserted therein a rail 16 (F until abutments force the jaws into the casings. In this case these abutments consist of rollers 17 placed on the jaws 3 of the lower tool, said rollers preventing by the contact with the jaws 2 of the upper tool the jaws of the two tools from further advance, and at the same time limiting the penetration of the edges of the jaws into the work piece. As the two outer casings approach each other and the work piece, the jaws are forced into the casings while turning about the pins 24, the jaws thereby being forced together and the rib pressed up. Consequently according to the present invention the projections or lugs are obtained by depression of the intermediate material, the

lot

placed in an eccentric press,

projections thus formed being pressed together so as to form flanges.

Preferably the tools above mentioned are the projections being produced and ressed together to flanges inone stroke 0 the eccentr1c press, so that it ap ears as if the I'lbS were pressed out directl From the relatively smooth plate. When p acing the apgaratus in the eccen tric press indicated in ig. 5, the arrangement is taken that the atest movement of the jaws is efiected w en presmg down the edges of the jaws into the plate and at the moment when the greatest counter-pressure in the chamber above the piston 10 is needed said movement decreasin at the commencement of the operation, or pressing up the ribs when a less counter-pressure is necessary. Thus the great counter-pressure, which only in part is needed, does not occur during the whole operation, the

stresses and the yielding action caused thereby being reduced. The said controlling of the counter-pressure may be effected by suitable throttling of the opening in the supply conduit 8. To this purpose the conduit 8 in the embodiment shown in Fig. 2 is provided with a screw sleeve 18 in which a reducing late 19 is inserted and provided with a smal opening 20, the magnitude of which is adjusted according to the counterpressure desired above the piston 10. Of course, the counter-pressure desired may also be obtained by suitable sizing of the conduit 8 which, however, is very difiicult, since the section of passage has to be exactly calculated and adjusted. B changing the reducing plates having iflerent sections of passage the counter-pressure may be adjusted according to the material of the work piece.

Fig. 3 illustrates the positions of the edges when being forced into the plate or the casing, or in other words before the jaws are turned about the pins 24.

When pressing u flanges on elements consisting of flattens pipes, it has appeared that flaws and buckles will be formed in front of the tool on the side where ribs have not yet been pressed up. To prevent this drawback the tool may at this side be provided with abutments 21 which during the operation are pressed simultaneously against the plate thus preventing the deformation of the plate by buckling. Preferably said abutments 21 should not reach the edges 4 and 5 but bear against the edge, as shown in Fig. 3, close inside the same, thus allowing the edges 4and 5 to be properly pressed down into the plate. I

What I claim as new and desire to secure matinee by Letters Patent of the United States is 1. Process of producing ribs or flanges on plates or the like, as for instance on cooling elements, characterized by the ribs or flanges being formed by means of two jaws movable towards and from each other and the plate, the jaws first being pressed into the plate in one direction and then forced together in another direction. v

2. A process according to claim 1 applied to both outer sides of the plate and further characterized by .ribs or flan es being pressed up at said both sides simuflaneously. 3. A rocess according to claim 1 characterized y the ribs or flanges being formed in parallel to one another.

4. A process according to claim 1 and further characterized by the ribs or flanges being made on flattened pipes into which a rail or the like is inserted.

5. An apparatus for performing the rocess' set forth in claim 1, characterize b two jaws movable towards and from eac other and the plate in such manner that the jaws first erform a parallel motion towards the p ate and then a motion towards each other. 4

6. An apparatus according to claim 5 characterized by the jaws being located in a casing actuating said jaws, a yielding device bemg interposed between the jaws and the casing in such mannerthat the movement of the jaws towards each other is effected after their depression into the plate.

7 An apparatus according to claim 5 and having a cushion of liquid placed between the jaws and the casing, characterized by the supply or outlet conduit (8) of the cushion of liquid being provided with an adjustable throttling device.

8. An apparatus according to claim 7, characterized by the throttling device con sisting of a plate or the like changeably inserted in the conduit by means of a screw sleeve or the like or in any other suitable manner, the plate being provided with an outlet opening corresponding to the counter-pressure desired.

9. An apparatus according to claim 5 characterized by at least one of two jaws situated opposite each other at either side of the workpiece being provided with an abutment so arranged as to be pressed against the workpiece upon the forcing of the jaws towards each other.

In testimony whereof I aflix my signature in presence oittwo witnesses.

FREDRIK LJUNGSTRijM.

Witnesses:

SNnz SWENSON, WILLIAM L. Pack. 

